A fuel cell stack consists of multiple single cells laminated together. In its operating state, a clamp load is applied to the stack by tightening the end plates using the bottles. If the clamp load is too low, contact resistance will increase, resulting in lower power generation efficiency and even fuel leaks. On the other hand, if the clamp load is too high, the fuel cell seal will deteriorate quickly. Although there are many ways to measure the load on an entire cell stack, until now there has been no way to measure the load distribution on an individual cell.